Past what's in the repo, I imagine some users maintain private plugins for themselves. Not much out there for such a niche player.
On the plus side, it's super easy to develop for, so if you wanted to not much would be in your way. Plugins are written in Javascript so you can do fun stuff like evaluate eval based packers directly without writing a single line of unpacker code or mock the webpage/player to run the page's code directly and pull the video url from the mocked player. Super unique platform to work on.